Rotary pump



INVENTOR Jm m N R m. T. A.

March 11 1924.

Filed May 1, 1923 Patented ar. M, 1924.

EBENEZER HILL, SOUTH NORWALK. CONNECTICUT, ASSIGNOR TO THE HILL COM-PRESSOR & PUMP COMPANY, OF NEW YORK. N. Y., A CORPORATION OF DELAWARE.

no'rnaY PUMP.

Application filed May 1,

To all whom it may concern:

Be it known that I, EBENEZER IIILL, a citizen of the United States,residing at South Norwalk, in the county of Fairfield and State ofConnecticut, have invented a new and useful Improvement in Rotary Pumps,of which the following is a speci-v fication. This invention relates tothe type of rotary pumps which have a casing with a pumping chambercontaining a rotatable outer element that surrounds and co-operativelyengages a rotatable inner element.

for pumping fluids.

The object of the invention is to provide simple means for lubricating,and at the same times utilize the lubricant for packing. the clearancespace between the adjacent surfaces of the outer rotatable element andstationar wall of the umping chamber, and there y reducing therictionbetween the parts and decreasing the liability of leakage of fluid fromthe pumping chamber around the driving and bearing elements of the pump.

In attaining this object the surface of the outer pumping-elementadjacent to the wall of the pum ing chamber is so shaped and providedwit lubricant carrying channels that centrifugalforce is utilized whenthe pump is in operation not only to spread the lubricant but cause thelubricant to pack the joints through which the fluid being pumped mightotherwise possibly leak.

In the accompanying drawings Fig. 1 shows a longitudinal section of arotary pump which embodies this invention. Fig. 2 showstransverse'section of the same on the plane indicated by the dotted line22 on Fig. 1, looking in the direction indicated by the arrows.

The pump illustrated has a casing 1 containing a cylindrical pumpingchamber 2. A head 3 is detachably fastened to the casing over the. openside of the pumping chamber. The outer pumping element has a peripheralrim fl that snugly but rotatably fits the peripheral wall of the pumpingchamber, and it has a face plate 5 that fits against the end wall of thepumping chamber. Tightly fitted within the rim of the outer pumpingelement is a ring6 with internal teeth 7. The face plate of-the outerpumping element has a hub 8 supported by bearing's 9 and the drivingshaft 10 is fitted in 1923. Serial No. 635,850.

' and keyed to this hub. A gland packing 11 is arranged about the hub atthe end of the casing and an expansible packing 12 is interposed betweenthe casing and the hub inside of the hearing.

The inner pumping element 13 has external teeth 14 and it is mounted ona bearing 15 which is fitted upon an arbor that has a journal 17 in thehead. When the shaftis rotated the intermeshing gears of the pumpingelements draw' fluid in through the intake 18 and force it out throughthe discharge 19 in the well known manner.

In carrying out this invention the corner of the rim of the outerpumping element is cut away, preferably by cha'mfering otf the edge soas to provide an annular cavity 20 between the corner of the outerpumping element and the corner of the pumping chamher. In the back ofthe face plate-of the outer umping element there are cavities 21.

here may be any desired number of these cavities and they may have anysuitable shape. In the particular instance illustrated thwe cavities arethe clearance holes for the heads of the screws 22 which are used tofasten the toothed ring 6 to the face plate 5. Grooves 23 are made inthe back face of the plate from these cavities to the chamfered cornerat the periphery of the outer pumping element. These grooves preferablystart from the inside edges of the cavities 21 and curve outward to theperiphery more or less spirally. The exact lubricant is spread around soas to form a film between the back face of the plate and the adjacentend wall of the pumping chamber. Under centrifugal action lubricant isconducted outward through the grooves and fills the cavity 20 at thecorner of the pumping chamber and thus packs As the pumping elements arerotated this ltlltl thejoint between the movable and stationaryparts atthis locality with a pressure dependent upon the speed of the pump.Owing to the fact that the grooves 23 start from the inside of thecavities 21 not all of the lubricant will be forced out of the cavities,enough remaining under centrif-- ugal action in their outer sections ofthe cavities to provide proper lubricant for the back of the plate.

Should any fluid attem t to leak from the pumping chamber aroun theperiphery of feet would be to force some of the lubricant out of thegrooves and cavities and spread it over the clearance space between theback of the pumping element and theend wall of the chamber thus making amore effective general seal for the pum and at the same time ensuring anefi'ectua lubrication of the surfaces infrictional contact.

The invention claimed is 1. Arotary ump having a casing with a pumpingcham er, and a rotatable pumping element within the chamber, saidchamber having an annular cavity adjacent to theperiphery of the pumpingelement, and said pumping element having means for causing lubricant toflow under centrifugal action to and exert pressure in said annularcavity.

2. A rotary ump having a casing with a pumping cham er, and a rotatablepumping element within the chamber, the corner of said pumping elementbeing cut away to provide an annular cavity between the pumping elementand the wall of the pumping chamber, and said pumping element havingmeans for causing lubricant to flow under centrifugal action to andexert pressure in said annular cavity.

3. A'rotary ump having a casing with a pumping cham 'er, and a rotatablepumping element within the chamber, said pumping element having a cornercut away to provide an annular cavity in the pumping chamber, and saidpumping element having grooves in its back face, leadin inward from thecut away corner to localities nearer the axis of the pumping element.

4. A rotary ump element having cavities in its back face, a. peripheralcorner chamfered off and grooves extending from the cavities to saidchamfered corner.

5. A rotary ump having a casing with a pumping cham er, and a rotatablepumping element within the chamber, said pumping element having, aehamfered edge so as to provide an annular cavity within the pumpingchamber, said pumping element also hav ing cavities in the back face andcurved grooves leading from the cavities to the chamfered edge. e

6. A rotary ump having a easingwith a pumping cham er, and a rotatablepumping element having an annular peripheral wall with internal teeth onthe inside of said peripheral wall and a face plate closing one side ofthe pumping element, said pumping chamber havin an annular cavityadjacent to the corner 0 the periphery of the pumping element, and saidlate having in its back wall adjacent to t e end wall of the pumpingchamber cavities with grooves exv having a casing with; pumping cham er,and a rotatable pumping element within the chamber, said pumping tendingin the face of the plate from the cavities to said annular cavity in thepumping chamber.

7. A rotary ump having a casingwith a pumping cham er, and a rotatablepumping element within the chamber, said chamber having an annularcavity adjacent to the periphery of the pumping element, and saidpumping element having spiral grooves in its back face for causinglubricant to flow under centrifugal action to and exert pressure in saidannular cavity.

8. A rotary ump having a casing with a pumping cham er, and a rotatablepumping element within the chamber, said pumping element having cavitiesin its back face, a peripheral cornerchamfered off and grooves extendingfrom the inner edges of said cavities to the chamfered corner of thepumping element.

- EBENEZER HILL.

